Hurricanes are part of a family of storms called tropical cyclones - storms that rotate rapidly around a low-pressure centre and produce heavy rain and strong winds.
Jose will continue to move to the west and could come close to the Leeward Islands, which were battered by Hurricane Irma earlier Wednesday. The worst case scenario would be for Hurricane Jose to follow Irma's path through the Caribbean islands and over towards Florida, but as mentioned, most modeling does not have that as the main solution.
The government has confirmed one death on Barbuda caused by Hurricane Irma.
A hurricane watch is in effect for Antigua and Barbuda, and a tropical storm watch is in effect for Anguilla, Montserrat, St Kitts and Nevis and Saba and St. Eustatius, according to the hurricane center.
By late Friday, Irma had regained Category 5 strength with winds of 160 miles per hour (260 kph). Katia is a Category 1, and is expected to make landfall late Friday.
John Huston, who was riding out the storm at his Key Largo home, was already seeing flooding in his yard before the arrival of high tide.
There is a possibility that Katia could evolve into a Category 2 hurricane before making landfall bringing with her 154 to 177 km/h (96 to 110 mph) winds prior to hitting the coast.
Hurricane season is in full swing and we have three devastating hurricanes now swirling through the Atlantic Ocean and Gulf of Mexico. The storm was expected to weaken rapidly over the next day, the NHC said. Katia has developed in the Gulf of Mexico.
Jose has been upgraded to a Category 3 hurricane.
NOAA in August predicted 14 to 19 named storms, five to nine hurricanes, and two to five major hurricanes for the season.
Hurricanes Jose and Katia are both getting stronger.
And though Jose is now shown heading north in the Atlantic, several of the 30 weather models offer the possibility that it could move toward the East Coast after Irma dies out, which could bring more rain and wind to Harrisburg.
When Hurricane Irma hit, one Briton was tweeting his experiences, describing it as "apocalyptic".
Tropical Storm Katia also strengthened to Hurricane Katia on Wednesday afternoon. In five days, a trough moving across the US should begin weakening the western edge of the ridge, allowing the storm to slide north.